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Tetrahedron 四面體
Author:
Steven S. H. Chu
GeoGebra
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兩位數加法
第八周作业
兩位數除以一位數（一）
拼砌四邊形
兩位數除以一位數（二）
Discover Resources
色彩視覺藝術：三色彩帶
S3 Percentages
Angle Between a Line and a Plane Definition 線與平面的交角 定義
大小相同串珠
拋物線--平行四邊形法
Discover Topics
Tree Diagrams
Rectangle
Binomial Distribution
Similar Triangles
Circle